Collet



June 3; 1924.

w. MORRISON COLLET File'd March 5. 1923 Patented June 3, 1924.

Harris WALTER MORRISON, 0F CANTON, OHIO, ASSIG-NOB TO THE TIMKEN ROLLER BEARING COMPANY, OF CANTON, OHIO, A CORPORATION OF OHIO.

GOLLET.

Application filed March 5, 1923.

T0 aZZ whom it may concern:

Be it known that I, WALTER, MORRISON, a citizen of the United States, and a resident of the city of Canton, in the county of Stark and State of Ohio, have invented a new and useful Improvement in Collets, of which the following is a specification.

My invention relates to collets, particularly those used to hold the conical blanks from which roller bearing cages are made, while the roller pockets are being punched therein; and has for its principal objects to devise a collet that will firmly and accurately hold the work, that will be strong and durable and that is provided with a wearing member that may be easily replaced. The invention consists principally in a two-part collet having a tapered bore adapted to fit the end of a conical blank and adapted to hold the blank without the use of spring members. The invention further consists in the collet and in the parts and combina tions of parts hereinafter described and claimed.

In the accompanying drawing,

Fig. 1 is a longitudinal sectional view of a collet embodying my invention and of a machine with which said collet is adapted to be used,

Fig. 2 is an end view of said collet,

Fig. 8 is a sectional view of the wearing member of said collet on the line 33 in Fig. 2, and

Fig. 4 is an end view of the inner tubular member of the collet.

A suitable machine for perforating cages for roller bearings and the like comprises a base 1 in which is mounted a projecting arm 2 adapted to form a support for the work, a frame 3 in which is rotatably mounted a shaft 4 to which is secured the collet G for holding the work, such as a blank 5 for a roller bearing cage, and a punch 6 adapted to punch out holes or slots in the work. The work support has a conical end portion 7 adapted to receive the work, and is preferably made with a removable cap portion 8 which forms the die that cooperates with the punch. A passageway 9 extends through the work support and the base to permit the escape of the metal punched out of the work. The collet supporting shaft 4 is provided with a ratchet wheel 10 or other suitable means whereby it may be rotated between the strokes of the plunger.

Serial No. 623,008.

The collet C comprises a tubular member 11 that is secured to the shaft, and a collar 12 or wearing member on the end of said tubular member. Said tubular member has an inwardly projecting flange 13 that is mounted on the shaft. Said flange 13 has a keyway let in which is disposed a key 15 on the shaft 4, so that the collet and shaft rotate together. A plate or washer 16 bears against the face of the flange and a suitable screw or bolt 17 holds said washer and tubular member in place.

Mounted on the end of the tubular member 11 of the collet is the wearing member or collar 12 whose tubular body portion fits on the end of the tubular member of the collet. At the end said collar is provided with an inwardly disposed annular flange 18, of less width than the thickness of the tubular member of the collet, whereby the end of said tubular member forms an abutment for the end of the work. The collar is also provided with a series of projecting fingers 19. Said fingers are disposed so as to form guides for the punch and at their bases said fingers are spaced apart substantially the width of a pocket of the cage to be punched and each substantially of the width of the strips to be left after the holes have been punched in the cage. The flange of the collar forms a conical recess adapted to receive the cage blank or other work. The bases of the fingers terminate flush with the flange and continue the conical surface thereof.

The conical blank is disposed in the end of the collet, the bore of the collet being of a size to exactly fit the end of the blank and hold it against turning. The end 20 of the tubular member is milled or roughened, and this gives the end of the tubular member frictional engagement with the end of the metal blank and assists in preventing turning of said blank with respect to the collet.

The blank is slipped on the support over the die and then the collet C and supporting frame 3 are moved toward the work support 2 until the collet slips over the end of, and holds, the cageblank, leaving the blank in proper position underneath the punch 6. The punch is then operated, and after each stroke thereof the collet supporting shaft is rotated, which rotates the blank over the work support.

The collet herein described has numerous advantages. It eliminates the use of spring fingers and the like which must be sprung together to hold the Work, and which are likely to break, and which also are likely to mar the end of the blank. The Wearing member may be removed from the tubular member when it is worn out, and replaced by another Wearing member. This reduces the cost of the collets.

lVhat I claim is:

1. A collet for holding conical articles in a punching machine or the like having a conical bore adapted to receive the Work and an annular abutment for the Work at the end overlapping said tubular member and forming a conical bore adapted to receive a conical blank.

4. A collet comprising a tubular member adapted to be secured to a rotary shaft, and a collar mounted on the end of said tubular member said collar having an annular flange of less Width than the thickness of said tubular member, said flange overlapping said tubular member and forming a conical bore adapted to receive a conical blank.

5. A collet comprising a tubular member adapted to be secured to a rotary shaft, and a collar mounted on the end of said tubular member said collar having an annular flange of less width than the thickness of. said tubular member. said flange overlapping said tubular member and forming a conical bore adapted to receive a conical blank and the end of said tubular member being roughened to frictionally engage the end of the blank.

Signed at Canton, Ohio. this 28th day of February, 1923.

VALTER MORRISON. 

